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https://issues.apache.org/jira/browse/IGNITE-1903?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Ozerov updated IGNITE-1903:
------------------------------------
Fix Version/s: (was: 2.0)
2.1
> Cache configuration is serialized to nodes whether they require it or not
> -------------------------------------------------------------------------
>
> Key: IGNITE-1903
> URL: https://issues.apache.org/jira/browse/IGNITE-1903
> Project: Ignite
> Issue Type: Bug
> Affects Versions: 1.5.0.final
> Reporter: Michael Griggs
> Labels: community
> Fix For: 2.1
>
>
> See User discussion thread:
> http://apache-ignite-users.70518.x6.nabble.com/CacheStore-being-serialized-to-client-td1931.html
> Brief summary: When a grid client joins the grid (clientMode=true) it
> receives a message from the server node(s) on the grid that contains the
> serialized CacheStore implementation object. If the client does not have
> this class on its CLASSPATH (and there is no reason it should, as it is a
> client) then the de-serialization of this message will fail, causing this
> exception:
> {code}SEVERE: Failed to unmarshal discovery data for component: 1
> class org.apache.ignite.IgniteCheckedException: Failed to find class with
> given class loader for unmarshalling (make sure same versions of all classes
> are available on all nodes or enable peer-class-loading):
> sun.misc.Launcher$AppClassLoader@14dad5dc
> at
> org.apache.ignite.marshaller.jdk.JdkMarshaller.unmarshal(JdkMarshaller.java:104)
>
> at
> org.apache.ignite.marshaller.AbstractMarshaller.unmarshal(AbstractMarshaller.java:67)
>
> at
> org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi.onExchange(TcpDiscoverySpi.java:1529)
>
> at
> org.apache.ignite.spi.discovery.tcp.ClientImpl$MessageWorker.processNodeAddFinishedMessage(ClientImpl.java:1317)
>
> at
> org.apache.ignite.spi.discovery.tcp.ClientImpl$MessageWorker.processDiscoveryMessage(ClientImpl.java:1229)
>
> at
> org.apache.ignite.spi.discovery.tcp.ClientImpl$MessageWorker.body(ClientImpl.java:1199)
>
> at org.apache.ignite.spi.IgniteSpiThread.run(IgniteSpiThread.java:62)
> Caused by: java.lang.ClassNotFoundException:
> c.g.r.cachewrapper.ignite.CacheMissHandlerIgnite
> {code}
> where {{c.g.r.cachewrapper.ignite.CacheMissHandlerIgnite}} is the CacheStore
> implementation.
> The ostensible reason for the CacheStore serialization is so that clients of
> a TRANSACTIONAL cache can begin the transaction on the underlying store.
> The only current solution to this is to add the grid node's CacheStore
> implementation class definition to the CLASSPATH of the client. This creates
> an *undesirable coupling* between server and client.
> ---
> *UPDATE (copy-paste from comment below)*
> This is actually more generic issue. When a new node joins (client or
> server), all existing cache configurations (which include cache stores) are
> sent to this node. It then deserializes it during startup which can cause
> exceptions on clients or servers where cache is not supposed to be deployed
> as defined by node filter.
> As a solution we can do the following:
> * During discovery, send node filter and cache store factory in binary format
> along with the cache configuration, not as its parts.
> * On server, check node filter first and deserialize cache configuration and
> cache store only if it returns true. In case of error, STOP join process (now
> we just print exception in log and go on, which is very error-prone).
> * On client, do not deserialize cache configuration and cache store until
> user's code tries to actually use the cache (calls Ignite.cache. If cache is
> ATOMIC, never deserialize the cache store.
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